Are all of your arrows the same, nock to vane.... If you have some cock vane up and some cock vane left and some cock vane down or a variety along those lines, that could be part of your problem. Find an arrow that shoots to point of aim, and use it as a compairson to set the other arrows and see what happens.

If you say that they are all the same, then I am at a loss... possibly rest problems....

MET